The answer is B. They both make comparisons, but simile uses as or like.
Answer: Today, we start using alternative sources of energy like solar power, wind power, geothermal, biomass, hydro power, waste energy and so on, because these renewable energy sources are not polluting the environment and are helping us to reduce the level of greenhouse gas emissions in the atmosphere and to reduce climate. Overall, these alternate forms are a huge help to our environment and support and benefit our personal and physical lives.
Explanation:
